#!/usr/bin/env python
# encoding: utf-8
# Licensed to the Apache Software Foundation (ASF) under one
# or more contributor license agreements.  See the NOTICE file
# distributed with this work for additional information
# regarding copyright ownership.  The ASF licenses this file
# to you under the Apache License, Version 2.0 (the
# "License"); you may not use this file except in compliance
# with the License.  You may obtain a copy of the License at
#
#   http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing,
# software distributed under the License is distributed on an
# "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
# KIND, either express or implied.  See the License for the
# specific language governing permissions and limitations
# under the License.

import urllib
from gstack import app, authentication
from gstack.services import requester
from gstack import helpers
from gstack import controllers
from gstack.controllers import errors
from flask import request, url_for


def _get_templates(authorization, args=None):
    command = 'listTemplates'
    if not args:
        args = {}

    if 'templatefilter' not in args:
        args['templatefilter'] = 'executable'

    cloudstack_response = requester.make_request(
        command,
        args,
        authorization.client_id,
        authorization.client_secret
    )
    return cloudstack_response


def get_template_by_name(authorization, image):
    image_list = _get_templates(
        authorization=authorization,
        args={
            'keyword': image
        }
    )

    if image_list['listtemplatesresponse']:
        response = controllers.filter_by_name(
            data=image_list['listtemplatesresponse']['template'],
            name=image
        )
        return response
    else:
        return None


def _create_populated_image_response(projectid, images=None):
    if not images:
        images = []

    populated_response = {
        'kind': 'compute#imageList',
        'selfLink': request.base_url,
        'id': 'projects/' + projectid + '/global/images',
        'items': images
    }
    return populated_response


def _cloudstack_template_to_gce(cloudstack_response, selfLink=None):
    translate_image_status = {
        'True': 'Ready',
        'False': 'Failed'
    }

    response = {}
    response['kind'] = 'compute#image'
    response['id'] = cloudstack_response['id']
    response['creationTimestamp'] = cloudstack_response['created']
    response['name'] = cloudstack_response['name']
    response['description'] = cloudstack_response['displaytext']
    response['status'] = translate_image_status[
        str(cloudstack_response['isready'])]

    if selfLink:
        response['selfLink'] = urllib.unquote_plus(selfLink)
    else:
        response['selfLink'] = urllib.unquote_plus(request.base_url)

    return response


@app.route('/compute/v1/projects/centos-cloud/global/images', methods=['GET'])
@authentication.required
def listnocentoscloudimages(authorization):
    populated_response = _create_populated_image_response('centos-cloud')
    return helpers.create_response(data=populated_response)


@app.route('/compute/v1/projects/debian-cloud/global/images', methods=['GET'])
@authentication.required
def listnodebiancloudimages(authorization):
    populated_response = _create_populated_image_response('debian-cloud')
    return helpers.create_response(data=populated_response)


@app.route('/compute/v1/projects/<projectid>/global/images', methods=['GET'])
@authentication.required
def listimages(projectid, authorization):
    image_list = _get_templates(
        authorization=authorization
    )

    if image_list['listtemplatesresponse']:
        for image in image_list['listtemplatesresponse']['template']:
            image['selflink'] = request.base_url + '/' + image['name']

    kwargs = {
        'template_name_or_list': 'images.json',
        'selflink': request.base_url,
        'request_id': 'projects/' + projectid + '/global/images',
        'request_kind': 'compute#imageList',
        'response': image_list['listtemplatesresponse']
    }
    return helpers.successful_response(
        **kwargs
    )


@app.route('/compute/v1/projects/<projectid>/global/images/<image>', methods=['GET'])
@authentication.required
def getimage(projectid, authorization, image):
    response = get_template_by_name(
        authorization=authorization,
        image=image
    )

    if response:
        return helpers.create_response(
            data=_cloudstack_template_to_gce(response)
        )
    else:
        func_route = url_for('getimage', projectid=projectid, image=image)
        return errors.resource_not_found(func_route)